The palace is flanked by two outbuildings which originally served as living quarters for servants and court clerks, as well as warehouses and utility rooms. The western outbuilding was erected in the early 18th century. One of the construction beams in the basement bears the date 1705. Both of the buildings were remodelled in a neo-Gothic style in the mid-19th century when Kozy was owned by Karol Humborg.  The western building housed a laundry, ironing room, mangle, sewing room and a bread oven. It also served as living quarters for the administrator, accountant, forester and a number of teachers. In 1915, during the stay in Kozy of the uhlans of the First Brigade of Józef Piłsudski’s Polish Legions, the western outbuilding was occupied by the officer staff headed by the unit’s commander, Cavalry Captain Władysław Belina-Prażmowski. During the military operations in 1945, it was taken over by the Red Army and converted into a military hospital. The Historical Chamber in the palace is named after the local historian and chronicler Adolf Zuber who lived in the western outbuilding. The eastern building was also built in the early 18th century, a few years after the western one. The first floor and the attic housed the granary and the ground floor was used for storing food. It also contained a large kitchen for the palace. By the end of the 1920s, the kitchen was moved to a new purpose-built annex of the palace. With time, the rooms of the eastern outbuilding were converted into flats for servants, a locksmith’s workshop and an archive room. Currently, both of the houses are used as communal flats.